From: "Jan Beulich" <JBeulich@suse.com>
To: Feng Wu <feng.wu@intel.com>
Cc: george.dunlap@eu.citrix.com, andrew.cooper3@citrix.com,
dario.faggioli@citrix.com, kevin.tian@intel.com,
xen-devel@lists.xen.org
Subject: Re: [PATCH v4 1/6] VMX: Statically assign two PI hooks
Date: Mon, 26 Sep 2016 05:37:40 -0600 [thread overview]
Message-ID: <57E924A4020000780011265B@prv-mh.provo.novell.com> (raw)
In-Reply-To: <1474425470-3629-2-git-send-email-feng.wu@intel.com>
>>> On 21.09.16 at 04:37, <feng.wu@intel.com> wrote:
> PI hooks: vmx_pi_switch_from() and vmx_pi_switch_to() are
> needed even when any previously assigned device is detached
> from the domain. Since 'SN' bit is also used to control the
> CPU side PI and we change the state of SN bit in these two
> functions, then evaluate this bit in vmx_deliver_posted_intr()
> when trying to deliver the interrupt in posted way via software.
> The problem is if we deassign the hooks while the vCPU is runnable
> in the runqueue with 'SN' set, all the furture notificaton event
> will be suppressed. This patch makes these two hooks statically
> assigned.
So if only SN left set is a problem, why do you need to also keep
vmx_pi_switch_from in place? It's vmx_pi_switch_to() which clears
the bit, and vmx_deliver_posted_intr() doesn't actively change it.
Jan
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next prev parent reply other threads:[~2016-09-26 11:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-21 2:37 [PATCH v4 0/6] VMX: Properly handle pi descriptor and per-cpu blocking list Feng Wu
2016-09-21 2:37 ` [PATCH v4 1/6] VMX: Statically assign two PI hooks Feng Wu
2016-09-26 11:37 ` Jan Beulich [this message]
2016-09-26 12:09 ` Jan Beulich
2016-09-28 6:48 ` Wu, Feng
2016-09-28 9:38 ` Jan Beulich
2016-10-09 8:30 ` Wu, Feng
2016-10-10 7:26 ` Jan Beulich
2016-09-21 2:37 ` [PATCH v4 2/6] VMX: Properly handle pi when all the assigned devices are removed Feng Wu
2016-09-26 11:46 ` Jan Beulich
2016-09-28 6:50 ` Wu, Feng
2016-09-28 9:52 ` Jan Beulich
2016-09-29 3:08 ` Wu, Feng
2016-09-21 2:37 ` [PATCH v4 3/6] VMX: Cleanup PI per-cpu blocking list when vcpu is destroyed Feng Wu
2016-09-21 2:37 ` [PATCH v4 4/6] VMX: Make sure PI is in proper state before install the hooks Feng Wu
2016-09-26 12:45 ` Jan Beulich
2016-09-28 6:50 ` Wu, Feng
2016-09-21 2:37 ` [PATCH v4 5/6] VT-d: No need to set irq affinity for posted format IRTE Feng Wu
2016-09-26 12:58 ` Jan Beulich
2016-09-28 6:51 ` Wu, Feng
2016-09-28 9:58 ` Jan Beulich
2016-10-09 5:35 ` Wu, Feng
2016-10-10 7:02 ` Jan Beulich
2016-10-10 22:55 ` Wu, Feng
2016-09-21 2:37 ` [PATCH v4 6/6] VMX: Fixup PI descritpor when cpu is offline Feng Wu
2016-09-26 13:03 ` Jan Beulich
2016-09-28 6:53 ` Wu, Feng
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